This is not the only place where the rows and columns have been interchanged. It appears that some of the Playground pages were edited incorrectly several months ago. A few days ago I sent a private message about this to the person who I believe made those changes but I have not received an answer back.

In the funny world of lcd displays, the (0,0) is top left, which is quite different from conventional x,y co-ordinates in the math books. I think this is confusing sometimes.

There are alot of little things like this to get used to with microcontrollers ... such as counting starting at 0, I made many a mistake when first starting out.. always start counting at 1 and mess things up.

And I got an LCD that has 131x131 pixels... and it's the same way! Makes for a hassle when you're trying to remember exactly where that pixel would be on the screen.